CN106638282A - Mild-steel-damping seismic mitigation and isolation support - Google Patents

Abstract

The invention discloses a soft damping steel shock-absorbing and isolation support, which comprises an upper support plate and a lower support plate, and also includes: a column, the upper end of which is rigidly fixed to the center of the lower surface of the upper support plate, and the lower end is connected to the lower surface of the upper support plate. The upper surfaces of the support plates are matched by friction surfaces; the mild steel damping device has an outer ring body and an inner ring body set on the column and coaxial with the outer ring body, and a connecting ring body and the outer ring body A mild steel connecting body; wherein, the outer ring body is provided with radial constraints around the outer ring body on the lower support plate. The soft damping steel vibration-absorbing and isolating bearing according to the invention has a compact structure.

Description

Soft damping steel shock-absorbing and isolating bearing

technical field

The invention relates to a soft damping steel shock-absorbing and isolating support, which is a kind of bridge support.

Background technique

The name of the soft damping steel shock-absorbing and isolation bearing comes from the mild steel damper, which is mainly used in the construction field due to its stable hysteretic characteristics, good low-cycle fatigue characteristics, and little influence from the surrounding environment. For example, structural nodes, supports (similar to bridge bearings), shear walls, joints, floor spaces, adjacent buildings, and main and attached structures on the building are consumed by bending, shearing, or torsional deformation of the damping device. Dissipate the seismic energy, reduce the seismic response of the structure, and effectively reduce the structural damage.

As an extension of the building structure, mild steel dampers are increasingly used in bridge supports. However, although mild steel dampers have very good energy dissipation performance, the soft damping formed by the current application on bridge supports Cylinder shock-absorbing and isolating bearings are generally bulky, which seriously affects their assembly, storage and transportation. Therefore, it has become an urgent problem to be solved to maintain the good energy dissipation performance of the mild steel damper and reduce the volume of this type of shock-absorbing and isolating bearing.

Typically, as in the Chinese patent document CN102409609A, an elastic-plastic damper (mild steel damper is one of them) is used to dissipate seismic energy in conjunction with a velocity locking period, which maintains the general structure of the traditional spherical bridge bearing, that is, its The center is still the spherical bearing part, and then the elastic-plastic damper and speed locker are installed on the periphery of the spherical bearing. Compared with the spherical bearing, its longitudinal or transverse dimension is at least doubled, and the volume is too large .

Similarly, the Chinese patent document CN201605530U also adopts a structure in which a mild steel damper is added to the periphery of the traditional spherical bearing. In the direction of adding the mild steel damper, its size is two to three times that of the traditional spherical bearing.

Another example is that the Chinese patent document CN102061666A is to set X-type mild steel dampers on both sides of the traditional lead-core laminated rubber bearings. The bearings are kept at a sufficient distance so that the bearings of this type of bridge are oversized on the left and right sides.

In order to reduce the volume, the Chinese patent document CN105887668A adopts butterfly springs for buffering, which has a guide column and a set of butterfly springs sleeved on the guide column. The one with the largest coefficient, however, is still inferior to mild steel dampers. Therefore, its vertical dimension is too large, and it is easy to lose stability. Therefore, it has to install some C-shaped soft dampers around the butterfly springs. Steel damper, the C-type soft steel damper not only further improves the elasticity of the bridge support, but also can make the butterfly spring part more stable. However, the C-shaped structure is a bow-shaped structure, which will inevitably increase the volume in the bow-shaped direction, and overall, the structure produced by the cooperation of the mild steel damper and the butterfly spring is rather complicated.

Contents of the invention

In view of this, the object of the present invention is to provide a soft damping steel shock-absorbing and isolating support with a compact structure.

The present invention adopts following technical scheme:

A soft damping steel shock-absorbing and isolating bearing, comprising an upper bearing plate and a lower bearing plate, and also includes:

A column, the upper end of which is rigidly fixed to the center of the lower surface of the upper support plate, and the lower end is matched with the upper surface of the lower support plate through a friction surface;

The mild steel damping device has an outer ring body, an inner ring body set on the column and coaxial with the outer ring body, and a mild steel connecting body connecting the inner ring body and the outer ring body;

Wherein, radial constraints of the outer ring body are arranged around the outer ring body on the lower bearing plate.

For the aforementioned soft damping steel shock-absorbing and isolating support, optionally, the soft steel connecting body is a spoke for connecting the outer ring body and the inner ring body.

Optionally, the spokes are spokes in the radial direction of the outer ring body.

Optionally, there are four spokes.

Optionally, the radial constraints are baffles arrayed on the periphery of the outer ring body.

Optionally, the number of the baffles is equal to the number of the spokes, and each baffle is located between two spokes in the circumferential direction of the outer ring body.

Optionally, the inner ring body is limited circumferentially and axially by the column.

Optionally, the circumferential limit of the inner ring body on the column adopts the key connection between the inner ring body and the column, while the axial limit of the inner ring body on the column depends on the end faces formed by the entities connected to the upper and lower ends of the column constraint.

Optionally, a mortise joint is used between the column and the upper support plate.

Optionally, the lower end surface of the column cooperates with the lower support plate through a slide plate.

According to the present invention, different from the prior art, the soft damping steel part is arranged between the upper and lower support plates, and the deformation of the outer ring body and the soft steel connecting body is used to provide deformation damping, without occupying additional space, and the structure is very compact.

Description of drawings

Figure 1 is a schematic diagram of the main section structure (partial half section) of a soft damping steel shock-absorbing and isolating support extending the present invention.

Fig. 2 is a schematic bottom view of an upper support plate.

Fig. 3 is a front structural schematic diagram of a lower support plate.

FIG. 4 is a schematic top view corresponding to FIG. 3 .

Fig. 5 is a structural schematic diagram of a mild steel damping device.

In the figure: 1. Upper support plate, 2. Lower support plate, 3. Mild steel damping device, 4. Polyethylene slide plate, 5. Column, 6. Dustproof hoarding.

11. Tenon and groove, 12. Upper support plate body.

21. Lower support plate body, 22. Baffle plate.

31. Outer ring body, 32. Inner ring body, 33. Wheel spokes, 34. Hub hole, 35. Interring space.

detailed description

As shown in Figure 1, a soft damping steel shock-absorbing and isolating bearing is the same as the existing bridge bearing. The basic structure of the soft-damping steel shock-isolating bearing is also an upper and lower structure, and the upper structure is the upper support The slab 1 is used to carry eg a beam body, the underlying structure is the lower bearing slab 2, generally mounted on eg a bridge pier.

In the structure shown in Figure 1, there is also a column 5, and the upper end of the column 5 is rigidly fixed to the center of the lower surface of the upper support plate 1, or is fixedly connected with the upper support plate 1 as a whole, and the upper end of the column 5 is fixed with the upper support plate 1. 1 together form a roughly T-shaped structure, in which the column 5 is similar to a drooping part, which is essentially a part for the lower support plate 2 to transfer and support the upper support plate 1.

It can be seen that the upright column 5 should have sufficient support rigidity, according to which, those skilled in the art can easily set its torsional shear resistance.

The lower end of the column 5 cooperates with the upper surface of the lower bearing plate 2, which is a sliding fit in the conventional sense in bridge bearings, such as the sliding interface formed by the polyethylene slide 4 as shown in Figure 1 .

In order to obtain a good sliding condition, a groove for storing grease is opened on the friction surface of the polyethylene slide plate 4 to reduce the coefficient of friction.

At the same time, in order to prevent or reduce the pollution of impurities such as dust, the periphery between the upper support plate 1 and the lower support plate 2 should be protected by a dust-proof enclosure 6.

The dust-proof enclosure 6 adopts a drooping enclosure structure, that is, the upper end of the dust-proof enclosure 6 is fixed on the upper support plate 1 , and the lower end is close to the lower support plate 2 without being too closely joined with the lower support plate 2 .

In the present invention, the core lies in the installation structure of the mild steel damping device 3 on the bridge support, which is different from the conventional soft damping steel bridge support. In the present invention, it is arranged inside the bridge support, so that it does not need to occupy a large installation space, in order to achieve this purpose, the mild steel damping device 3 is arranged inside the bridge support, referring to the structure illustrated in Figure 5, the mild steel damping device 3 shown in the figure is a double ring with a common axis Structure, there is a connecting part between the two rings, such as the spoke 33 shown in the figure, which is made of soft steel as a whole. When the outer ring is squeezed in a certain direction, it will deform and produce damping .

The response of the ring body to the surrounding extrusion is in the range of 360 degrees, and its deformation is manifested in the elastic deformation of the ring body. After the factors causing ring body deformation due to external factors are eliminated, the recovery of elastic deformation will reset the bearings of this type of bridge.

In the structure shown in Figure 5, the mild steel damping device 3 has an outer ring body 31 that directly bears deformation, and an inner ring body 32 for installing the mild steel damping device 3, wherein the inner ring body 32 is sleeved on the column 5 and It is coaxial with the outer ring body 31 so that its response to the extrusion of the periphery is substantially the same.

Because there is also a connection relationship, as shown in Figure 5, the spokes 33 connecting the inner ring body 32 and the outer ring body 31, obviously the closer to the spokes 33, the greater the static stiffness of the outer ring body 31, under the same extrusion force condition The lower the deformation, the smaller the deformation. Therefore, the response of the outer ring body 31 to the surrounding area is substantially different except for a specific area.

Specific areas, such as the positions where the four spokes 33 are directly connected, should be understood to be the same under ideal conditions.

In addition, as a further configuration, the upper support plate 1 and the column 3 are rigidly connected, the column 3 is fitted with the inner ring body 32, and the extrusion on the outer ring body 31 should come from the reverse force of the lower support plate 2, Obviously, in order to achieve damping, the radial constraint of the outer ring body 31 should be provided on the lower bearing plate 2 around the outer ring body 31 , so that the extrusion can be configured between the upper bearing plate 1 and the lower bearing plate 2 .

In view of the above structure, the ring-shaped soft damping steel is used to limit it between the upper and lower support plates, so that the structure is very compact and can meet the required damping effect.

In the structure shown in Figure 5, the mild steel connecting body is the spoke 33 used to connect the outer ring body 31 and the inner ring body 32, that is, a spaced connection between the inner and outer ring bodies can save materials, And the deformation of the outer ring body 31 is relatively less interfered.

In addition, as mentioned above, the support of the outer ring body 31 by the spokes 33 is partially strengthened, or the local stiffness of the outer ring body 31 is increased, especially the part connected to the outer ring body 31. When deformation occurs, the connecting part will There is a phenomenon of stress concentration, especially when the connection part is in a state of skewed connection. Therefore, the number of spokes 33 should not be too many, otherwise, the connection structure between a certain spoke 33 and the outer ring body 31 will easily break.

The number of spokes 33 can not be less than 3, but can not be more than 6, preferably 4.

Regarding the arrangement of the spokes 33 , in some embodiments, as shown in FIG. 5 , it is a radial spoke, that is, it corresponds to the radial spoke of the outer ring body 31 . In this type of structure, the responsiveness of the outer ring body 31 to external extrusion is approximately symmetrically distributed with respect to the connection points of the spokes 33 .

In some embodiments, the opposite is done, the spokes 33 form a certain angle with the radial line of the connected part, and it is advisable to deflect less than 45 degrees and greater than 30 degrees. Under this condition, deformation except the outer ring In addition to the deformation of the body 31, the deformation of the spoke 33 itself is also very large. Under this condition, although the static stiffness of the outer ring body 31 is different due to the connection between the spokes 33 and the outer ring body 31, the attribute of different static stiffnesses is weakened due to the large deformation of the spokes 33 , the responsiveness of the outer ring body 31 to the outside approaches.

Regarding the radial constraint of the lower support plate 2 on the mild steel damping device 3, in some embodiments, the lower support plate 2 can be configured as a barrel-shaped body, and the radial constraint is configured as a barrel wall. This type of structure is an outer ring body The response configuration flexibility of the 31 deformation is relatively poor, but the structure is relatively simple.

In some embodiments, the radial constraint is the baffles 22 arrayed on the periphery of the outer ring body 31 , and the baffles 22 can form a local support for the outer ring body 31 , so that the arrangement flexibility is better.

Preferably, the number of the baffles 22 is equal to the number of the spokes 33 , and each baffle 22 is located between two spokes 33 in the circumferential direction of the outer ring body 31 . In this type of structure, the movement of the upper support plate 1 to any direction will be transferred to the position where the baffle plate 22 acts on the outer ring body 31 between the two spokes 33, thereby effectively eliminating the need for the outer ring body. 31 Problems caused by inconsistent stiffness of various parts. Specifically, the existence of the baffle plate 22 and the positional relationship between the baffle plate 22 and the outer ring body 31, specifically the fact that the baffle plate 22 is interposed between two adjacent spokes 33, the deformations are all shown in the “between” "Constrained range, so the deformation controllability is better.

To carry on the above content, when it is necessary to control the deformation of the outer ring body 31, the inner ring body 32 needs to be reliably restrained in the circumferential direction of the column 5. For this reason, the inner ring body 32 and the column adopt a circumferential limit, such as Key connections can also be surface fit or interference fit.

In addition, the deformation of the outer ring body 31 should reduce the interference, especially the interference with the upper bearing plate 1 and the lower bearing plate 2, so the outer ring body 31 should be avoided. The plates 2 come into contact, specifically, through axial limiting.

The conventional structure of axial limit is realized by such as retaining ring, shaft shoulder, collar or sleeve, etc., and as shown in Figure 1, the cross-sectional structure of the mild steel damping device can be seen in the figure, and the inner ring body 32 can be seen relatively long, relatively speaking, it can be considered as a sleeve structure, the upper end of the sleeve structure exposes the upper end surface of the outer ring body 31, and the lower end exposes the lower end surface of the outer ring body 31, thereby effectively forming a support , so as to avoid the constraints of the outer ring body 31 and the upper bearing plate and the lower bearing plate.

In addition, the inner ring body 32 can be only a ring structure, and the upper and lower positions are limited by other limiting components, such as shaft shoulders, sleeves or retaining rings.

In addition, as shown in Figure 2, the lower surface of the lower support plate 12 is provided with a mortise 11, correspondingly, the upper end of the column 5 is provided with a tenon, so that the column 5 and the upper support plate 1 are connected by tenons. , simple structure and reliable connection.

In addition, regarding the number of tenons and grooves 11 , the number thereof can be seen in FIG. 2 . In FIG. 2 there are four tenons and tenons, and there are four tenons, which are matched and connected.

Claims (10)

1. A soft damping steel shock-absorbing and isolating support, comprising an upper support plate (1) and a lower support plate (2), characterized in that it also includes: Column (5), the upper end of the column (5) is rigidly fixed to the center of the lower surface of the upper support plate (1), and the lower end of the column (5) cooperates with the upper surface of the lower support plate (2) through a friction surface; The mild steel damping device (3) has an outer ring body (31) and an inner ring body (32) which is set on the column (5) and is coaxial with the outer ring body (31), and connects the inner ring body (32 ) and the mild steel connecting body of the outer ring body (31); Wherein, radial constraints of the outer ring body (31) are provided on the lower support plate (2) around the outer ring body (31). 2. The soft damping steel shock-absorbing and isolating support according to claim 1, characterized in that the soft steel connecting body is a spoke (33) used to connect the outer ring body (31) and the inner ring body (32) . 3. The shock-absorbing and isolating bearing of soft damping steel according to claim 2, characterized in that, the spokes (33) are spokes in the radial direction of the outer ring body (31). 4. The shock-absorbing and isolating support made of soft damping steel according to claim 2 or 3, characterized in that there are four spokes (33). 5. The soft damping steel shock-absorbing and isolating support according to claim 4, characterized in that, the radial constraint is a baffle (22) arrayed on the periphery of the outer ring body (31). 6. The soft damping steel shock-absorbing and isolating support according to claim 5, characterized in that, the number of the baffles (22) is equal to the number of the spokes (33), and each baffle (22) Between the two spokes (33) in the circumferential direction of the outer ring body (31). 7. The soft damping steel shock-absorbing and isolating support according to any one of claims 1-3, characterized in that the inner ring body (32) is limited in the circumferential and axial directions on the column (5). 8. The soft damping steel shock-absorbing and isolating support according to claim 7, characterized in that, the circumferential limit of the inner ring body (32) on the column (5) adopts the inner ring body (32) and the column (5) ), and the axial limit of the inner ring body (32) on the column (5) depends on the end surface constraints formed by the connected entities at the upper and lower ends of the column (5). 9. The soft damping steel shock-absorbing and isolating support according to any one of claims 1-3, characterized in that, the upright column (5) and the upper support plate (1) are mortised and tenoned. 10. The soft damping steel shock-absorbing and isolating support according to any one of claims 1-3, characterized in that, the lower end surface of the column (5) cooperates with the lower support plate (2) through a slide plate.